Im a bit afraid of using node red, its just too complicated so ive resorted back to Assistant in VE config.
What would happen if i set the pv inverter tab to NO, as if no pv inverters are installed, to stop the frequency shifting.
Then when the batteries reach 95% soc (which is when bulk turns off) the ac ignore gets deactivated and the system becomes grid tied again so the microinverters can export the excess, without the need to frequency shift, would this work to keep the microinverters running and back feeding into ac out1 to charge the batteries? Or does this stop the inverter from charging through ac1 altogether?
Another thing im a bit confused about is why ac microinverters need to be powered off via frequency shifting in the first place because the battery bms should refuse power and regulate charging and if the microinverter power jas no where to go, doesnt it just sit idle? Like batteries sit idle until you connect a load, or even my multiplus, its still inverting even with no load connected, but it doesn’t self distruct because of this, so why are pv inverters different?
One more question regarding the multiplus ii, in the charger settings theres several parameters to configure, are these configurations only for AC in, or do they also appy when back feeding charging power into AC1 out as with pv inverters?
Ill answer my own question here, after some configuration experiments.
Currently my inverter is running with AC in ignore active and a 67% soc.
My enphase microinverters are now also producing power and back feeding to the batteries via AC1 out. I tricked the system by telling it that there is no PV inverter present, therfore no frequency shifting needed when ac in is ignored.
I have configured it that once soc reaches 95% , that AC in ignore is cancelled and the microinverters can export excess power instead of having to shut down.
Can this configuration be ok?
Fequency shifitng has to happen when your batteries are full and you are off grid because say of a blackout. Frequency shifting has to be “programmed” with VE Config in the ESS assistant when you tell the system that you have PV on AC-out. I also have Enphase on AC-out. These are my set frequencies.
Also being that my enphase system is connected to ac1 out and if there is a blackout on the grid, doesnt the mp2 automatically switch off the “ac in” relay to prevent ac being fed out to the grid from my own generation?
You said when your off grid and “say of a blackout” do you mean an off grid blackout, say if the mp2 failed? Then the enphase wont get ac and shut down without frequency shifting?
Ive progrmmed it so that i wont be off grid (so AC in ignore is deactivated,) and im back on grid in ess when the batteries reach 95% soc, so basically the batteries will never be full while off grid.
The reason ive deleted my pv inverters is because they stop generating when ac in is ignored, but now they generate and charge the batteries just fine with ac in ignored being that i checked the “no” box in the pv inverters tab.
Yes AC-in is switched off so there is no grid feed in (comes back a few minutes after grid returns).
But when PV is on AC-out 1, than PV can still charge your batteries (micros get there AC from the multis from the batteries).
But when batteries become full, thrue frequency shifting the micro’s have to stop producing solar to prevent overcharging your batteries.
These are my settings:
Im really trying to get to the bottom of this i do want pv inverter enabled and frequency shifting, but it just stops producing when ac ignore is active, but i yhink i may have found the culprit, in assistat ess “voltage to restart pv” tab it says 40v , could this be why my enphase system shuts down? Because my batteries are at 53.6v according to VE configure info. So should i set this restart value to 53.6 so it produces?
I have attached a screen shot and my battery info.
No, i set ac in ignore as yes in general flag, tjen used general flag as the programmable relay and set ac in ignore only between 20% to 95% soc, then i set it not to ignore “NO” when soc is over and under those parameters.
So even after settling “voltage to restart pv inverters” to 56v (it was 40v before) and pv inverters to “yes” with frequency shift as 52hz , for the microinverters to stop producing. This still doesn’t work, the microinverters instantly stop producing and im finding the ac frequency is jumping around between 49hz and 52hz,
But i thought the bms stops charging the batteries, then if the microinverters still produce and have no where for the power to go, they just end up idle with no current flow. How can things self distruct if nothing is demanding current?
